Facing problem in submission

I am not able to submit week 3 assignment and it is giving error message “UNQ_C3 wasn’t found in code”. What should I do?

Restore the line of code that contained the text “UNQ_C3”.
Apparently you deleted it.

how can I restore it. Since I have no idea where that code exists

It should look like this:

Thanks for the help. It worked